1 /* Copyright (c) 2004-2015. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
7 /* \file callbacks.h */
9 #include "xbt/sysdep.h"
11 #include "xbt/mallocator.h"
12 #include "maxmin_private.hpp"
14 #include <stdio.h> /* sprintf */
16 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_maxmin, surf, "Logging specific to SURF (maxmin)");
18 typedef struct s_dyn_light {
22 } s_dyn_light_t, *dyn_light_t;
24 double sg_maxmin_precision = 0.00001;
25 double sg_surf_precision = 0.00001;
27 static void *lmm_variable_mallocator_new_f(void);
28 static void lmm_variable_mallocator_free_f(void *var);
29 #define lmm_variable_mallocator_reset_f ((void_f_pvoid_t)NULL)
30 static void lmm_update_modified_set(lmm_system_t sys, lmm_constraint_t cnst);
31 static void lmm_remove_all_modified_set(lmm_system_t sys);
32 static int Global_debug_id = 1;
33 static int Global_const_debug_id = 1;
35 static void lmm_var_free(lmm_system_t sys, lmm_variable_t var);
36 static inline void lmm_cnst_free(lmm_system_t sys, lmm_constraint_t cnst);
38 static void lmm_on_disabled_var(lmm_system_t sys, lmm_constraint_t cnstr);
39 static void lmm_enable_var(lmm_system_t sys, lmm_variable_t var);
40 static int lmm_can_enable_var(lmm_variable_t var);
41 static void lmm_disable_var(lmm_system_t sys, lmm_variable_t var);
42 static int lmm_concurrency_slack(lmm_constraint_t cnstr);
43 static int lmm_cnstrs_min_concurrency_slack(lmm_variable_t var);
45 static void lmm_check_concurrency(lmm_system_t sys);
47 inline int lmm_element_concurrency(lmm_element_t elem) {
48 //Ignore element with weight less than one (e.g. cross-traffic)
49 return (elem->value>=1)?1:0;
50 //There are other alternatives, but they will change the behaviour of the model..
51 //So do not use it unless you want to make a new model.
52 //If you do, remember to change the variables concurrency share to reflect it.
53 //Potential examples are:
54 //return (elem->weight>0)?1:0;//Include element as soon as weight is non-zero
55 //return (int)ceil(elem->weight);//Include element as the rounded-up integer value of the element weight
58 inline void lmm_decrease_concurrency(lmm_element_t elem) {
59 xbt_assert(elem->constraint->concurrency_current>=lmm_element_concurrency(elem));
60 elem->constraint->concurrency_current-=lmm_element_concurrency(elem);
63 inline void lmm_increase_concurrency(lmm_element_t elem) {
64 elem->constraint->concurrency_current+= lmm_element_concurrency(elem);
66 lmm_constraint_t cnstr=elem->constraint;
68 if(cnstr->concurrency_current > cnstr->concurrency_maximum)
69 cnstr->concurrency_maximum= cnstr->concurrency_current;
71 xbt_assert(cnstr->concurrency_limit<0 || cnstr->concurrency_current<=cnstr->concurrency_limit,
72 "Concurrency limit overflow!");
75 lmm_system_t lmm_system_new(int selective_update)
77 lmm_system_t l = NULL;
79 s_lmm_constraint_t cnst;
81 l = xbt_new0(s_lmm_system_t, 1);
84 l->selective_update_active = selective_update;
85 l->visited_counter = 1;
87 XBT_DEBUG("Setting selective_update_active flag to %d", l->selective_update_active);
89 xbt_swag_init(&(l->variable_set), xbt_swag_offset(var, variable_set_hookup));
90 xbt_swag_init(&(l->constraint_set), xbt_swag_offset(cnst, constraint_set_hookup));
92 xbt_swag_init(&(l->active_constraint_set), xbt_swag_offset(cnst, active_constraint_set_hookup));
94 xbt_swag_init(&(l->modified_constraint_set), xbt_swag_offset(cnst, modified_constraint_set_hookup));
95 xbt_swag_init(&(l->saturated_variable_set), xbt_swag_offset(var, saturated_variable_set_hookup));
96 xbt_swag_init(&(l->saturated_constraint_set), xbt_swag_offset(cnst, saturated_constraint_set_hookup));
98 l->variable_mallocator = xbt_mallocator_new(65536,
99 lmm_variable_mallocator_new_f,
100 lmm_variable_mallocator_free_f,
101 lmm_variable_mallocator_reset_f);
106 void lmm_system_free(lmm_system_t sys)
108 lmm_variable_t var = nullptr;
109 lmm_constraint_t cnst = nullptr;
114 while ((var = (lmm_variable_t) extract_variable(sys))) {
115 XBT_WARN("Variable %d still in system when freing it: this may be a bug", var->id_int);
116 lmm_var_free(sys, var);
118 while ((cnst = (lmm_constraint_t) extract_constraint(sys)))
119 lmm_cnst_free(sys, cnst);
121 xbt_mallocator_free(sys->variable_mallocator);
125 static inline void lmm_variable_remove(lmm_system_t sys, lmm_variable_t var)
130 lmm_element_t elem = NULL;
132 XBT_IN("(sys=%p, var=%p)", sys, var);
135 //TODOLATER Can do better than that by leaving only the variable in only one enabled_element_set, call
136 //lmm_update_modified_set, and then remove it..
137 if(var->cnsts_number)
138 lmm_update_modified_set(sys, var->cnsts[0].constraint);
140 for (i = 0; i < var->cnsts_number; i++) {
141 elem = &var->cnsts[i];
143 lmm_decrease_concurrency(elem);
144 xbt_swag_remove(elem, &(elem->constraint->enabled_element_set));
145 xbt_swag_remove(elem, &(elem->constraint->disabled_element_set));
146 xbt_swag_remove(elem, &(elem->constraint->active_element_set));
147 nelements=xbt_swag_size(&(elem->constraint->enabled_element_set)) +
148 xbt_swag_size(&(elem->constraint->disabled_element_set));
150 make_constraint_inactive(sys, elem->constraint);
152 lmm_on_disabled_var(sys,elem->constraint);
155 //Check if we can enable new variables going through the constraints where var was.
156 //Do it after removing all elements, so he first disabled variables get priority over those with smaller requirement
157 for (i = 0; i < var->cnsts_number; i++) {
158 elem = &var->cnsts[i];
159 if(xbt_swag_size(&(elem->constraint->disabled_element_set)))
160 lmm_on_disabled_var(sys,elem->constraint);
163 var->cnsts_number = 0;
165 lmm_check_concurrency(sys);
170 static void lmm_var_free(lmm_system_t sys, lmm_variable_t var)
172 lmm_variable_remove(sys, var);
173 xbt_mallocator_release(sys->variable_mallocator, var);
176 static inline void lmm_cnst_free(lmm_system_t sys, lmm_constraint_t cnst)
178 make_constraint_inactive(sys, cnst);
182 lmm_constraint_t lmm_constraint_new(lmm_system_t sys, void *id, double bound_value)
184 lmm_constraint_t cnst = NULL;
185 s_lmm_element_t elem;
187 cnst = xbt_new0(s_lmm_constraint_t, 1);
189 cnst->id_int = Global_const_debug_id++;
190 xbt_swag_init(&(cnst->enabled_element_set), xbt_swag_offset(elem, enabled_element_set_hookup));
191 xbt_swag_init(&(cnst->disabled_element_set), xbt_swag_offset(elem, disabled_element_set_hookup));
192 xbt_swag_init(&(cnst->active_element_set), xbt_swag_offset(elem, active_element_set_hookup));
194 cnst->bound = bound_value;
195 cnst->concurrency_maximum=0;
196 cnst->concurrency_current=0;
197 //TODO MARTIN Maybe a configuration item for the default cap concurrency?
198 cnst->concurrency_limit=100;
200 cnst->sharing_policy = 1; /* FIXME: don't hardcode the value */
201 insert_constraint(sys, cnst);
206 int lmm_constraint_concurrency_limit_get(lmm_constraint_t cnst)
208 return cnst->concurrency_limit;
211 void lmm_constraint_concurrency_limit_set(lmm_constraint_t cnst, int concurrency_limit)
213 xbt_assert(concurrency_limit<0 || cnst->concurrency_maximum<=concurrency_limit,
214 "New concurrency limit should be larger than observed concurrency maximum. Maybe you want to call"
215 " lmm_constraint_concurrency_maximum_reset() to reset the maximum?");
216 cnst->concurrency_limit = concurrency_limit;
219 void lmm_constraint_concurrency_maximum_reset(lmm_constraint_t cnst)
221 cnst->concurrency_maximum = 0;
224 int lmm_constraint_concurrency_maximum_get(lmm_constraint_t cnst)
226 xbt_assert(cnst->concurrency_limit<0 || cnst->concurrency_maximum<=cnst->concurrency_limit,
227 "Very bad: maximum observed concurrency is higher than limit. This is a bug of SURF, please report it.");
228 return cnst->concurrency_maximum;
231 void lmm_constraint_shared(lmm_constraint_t cnst)
233 cnst->sharing_policy = 0;
236 /** Return true if the constraint is shared, and false if it's FATPIPE */
237 int lmm_constraint_sharing_policy(lmm_constraint_t cnst)
239 return (cnst->sharing_policy);
242 /* @brief Remove a constraint
243 * Currently this is dead code, but it is exposed in maxmin.h
244 * Apparently, this call was designed assuming that constraint would no more have elements in it.
245 * If not the case, assertion will fail, and you need to add calls e.g. to lmm_shrink before effectively removing it.
247 inline void lmm_constraint_free(lmm_system_t sys,lmm_constraint_t cnst)
249 xbt_assert(!xbt_swag_size(&(cnst->active_element_set)),"Removing constraint but it still has active elements");
250 xbt_assert(!xbt_swag_size(&(cnst->enabled_element_set)),"Removing constraint but it still has enabled elements");
251 xbt_assert(!xbt_swag_size(&(cnst->disabled_element_set)),"Removing constraint but it still has disabled elements");
252 remove_constraint(sys, cnst);
253 lmm_cnst_free(sys, cnst);
256 static void *lmm_variable_mallocator_new_f(void)
258 lmm_variable_t var = xbt_new(s_lmm_variable_t, 1);
259 var->cnsts = NULL; /* will be created by realloc */
263 static void lmm_variable_mallocator_free_f(void *var)
265 xbt_free(((lmm_variable_t) var)->cnsts);
269 lmm_variable_t lmm_variable_new(lmm_system_t sys, void *id, double weight, double bound, int number_of_constraints)
271 lmm_variable_t var = NULL;
274 XBT_IN("(sys=%p, id=%p, weight=%f, bound=%f, num_cons =%d)", sys, id, weight, bound, number_of_constraints);
276 var = (lmm_variable_t) xbt_mallocator_get(sys->variable_mallocator);
278 var->id_int = Global_debug_id++;
279 var->cnsts = (s_lmm_element_t *) xbt_realloc(var->cnsts, number_of_constraints * sizeof(s_lmm_element_t));
280 for (i = 0; i < number_of_constraints; i++) {
281 var->cnsts[i].enabled_element_set_hookup.next = NULL;
282 var->cnsts[i].enabled_element_set_hookup.prev = NULL;
283 var->cnsts[i].disabled_element_set_hookup.next = NULL;
284 var->cnsts[i].disabled_element_set_hookup.prev = NULL;
285 var->cnsts[i].active_element_set_hookup.next = NULL;
286 var->cnsts[i].active_element_set_hookup.prev = NULL;
287 var->cnsts[i].constraint = NULL;
288 var->cnsts[i].variable = NULL;
289 var->cnsts[i].value = 0.0;
291 var->cnsts_size = number_of_constraints;
292 var->cnsts_number = 0;
293 var->weight = weight;
294 var->staged_weight = 0.0;
296 var->concurrency_share = 1;
298 var->visited = sys->visited_counter - 1;
301 var->func_f = func_f_def;
302 var->func_fp = func_fp_def;
303 var->func_fpi = func_fpi_def;
305 var->variable_set_hookup.next = NULL;
306 var->variable_set_hookup.prev = NULL;
307 var->saturated_variable_set_hookup.next = NULL;
308 var->saturated_variable_set_hookup.prev = NULL;
311 xbt_swag_insert_at_head(var, &(sys->variable_set));
313 xbt_swag_insert_at_tail(var, &(sys->variable_set));
315 XBT_OUT(" returns %p", var);
319 void lmm_variable_free(lmm_system_t sys, lmm_variable_t var)
321 remove_variable(sys, var);
322 lmm_var_free(sys, var);
325 double lmm_variable_getvalue(lmm_variable_t var)
330 void lmm_variable_concurrency_share_set(lmm_variable_t var, short int concurrency_share)
332 var->concurrency_share=concurrency_share;
335 double lmm_variable_getbound(lmm_variable_t var)
340 void lmm_shrink(lmm_system_t sys, lmm_constraint_t cnst, lmm_variable_t var)
342 lmm_element_t elem = NULL;
346 for (i = 0; i < var->cnsts_number; i++) {
347 elem = &(var->cnsts[i]);
348 if (elem->constraint == cnst) {
355 XBT_DEBUG("cnst %p is not found in var %p", cnst, var);
361 XBT_DEBUG("remove elem(value %f, cnst %p, var %p) in var %p", elem->value, elem->constraint, elem->variable, var);
363 /* We are going to change the constraint object and the variable object.
364 * Propagate this change to other objects. Calling here before removing variable from not active elements
365 * (inactive elements are not visited)
367 lmm_update_modified_set(sys, cnst);
368 //Useful in case var was already removed from the constraint
369 lmm_update_modified_set(sys, var->cnsts[0].constraint); // will look up enabled_element_set of this constraint, and
370 //then each var in the enabled_element_set, and each var->cnsts[i].
372 if(xbt_swag_remove(elem, &(elem->constraint->enabled_element_set)))
373 lmm_decrease_concurrency(elem);
375 xbt_swag_remove(elem, &(elem->constraint->active_element_set));
376 elem->constraint = NULL;
377 elem->variable = NULL;
380 var->cnsts_number -= 1;
382 //No variable in this constraint -> make it inactive
383 if (xbt_swag_size(&(cnst->enabled_element_set))+xbt_swag_size(&(cnst->disabled_element_set)) == 0)
384 make_constraint_inactive(sys, cnst);
386 //Check maxconcurrency to see if we can enable new variables
387 lmm_on_disabled_var(sys,elem->constraint);
390 lmm_check_concurrency(sys);
393 void lmm_expand(lmm_system_t sys, lmm_constraint_t cnst, lmm_variable_t var, double value)
395 lmm_element_t elem = NULL;
401 //Check if this variable already has an active element in this constraint
402 //If it does, substract it from the required slack
404 if(var->concurrency_share>1){
405 for( i=0; i<var->cnsts_number;i++){
406 if(var->cnsts[i].constraint==cnst &&
407 xbt_swag_belongs(&var->cnsts[i],&(var->cnsts[i].constraint->enabled_element_set)))
408 current_share+=lmm_element_concurrency(&(var->cnsts[i]));
412 //Check if we need to disable the variable
413 if(var->weight>0 && var->concurrency_share-current_share>lmm_concurrency_slack(cnst)) {
415 lmm_disable_var(sys,var);
416 for (i = 0; i < var->cnsts_number; i++)
417 lmm_on_disabled_var(sys,var->cnsts[i].constraint);
419 var->staged_weight=weight;
420 xbt_assert(!var->weight);
423 xbt_assert(var->cnsts_number < var->cnsts_size, "Too much constraints");
425 elem = &(var->cnsts[var->cnsts_number++]);
428 elem->constraint = cnst;
429 elem->variable = var;
432 xbt_swag_insert_at_head(elem, &(elem->constraint->enabled_element_set));
433 lmm_increase_concurrency(elem);
435 xbt_swag_insert_at_tail(elem, &(elem->constraint->disabled_element_set));
437 if(!sys->selective_update_active) {
438 make_constraint_active(sys, cnst);
439 } else if(elem->value>0 || var->weight >0) {
440 make_constraint_active(sys, cnst);
441 lmm_update_modified_set(sys, cnst);
442 //TODOLATER: Why do we need this second call?
443 if (var->cnsts_number > 1)
444 lmm_update_modified_set(sys, var->cnsts[0].constraint);
447 lmm_check_concurrency(sys);
450 void lmm_expand_add(lmm_system_t sys, lmm_constraint_t cnst, lmm_variable_t var, double value)
456 lmm_check_concurrency(sys);
458 //BEWARE: In case you have multiple elements in one constraint, this will always add value to the first element.
459 for (i = 0; i < var->cnsts_number; i++)
460 if (var->cnsts[i].constraint == cnst)
463 if (i < var->cnsts_number) {
465 lmm_decrease_concurrency(&var->cnsts[i]);
467 if (cnst->sharing_policy)
468 var->cnsts[i].value += value;
470 var->cnsts[i].value = MAX(var->cnsts[i].value, value);
472 //We need to check that increasing value of the element does not cross the concurrency limit
474 if(lmm_concurrency_slack(cnst)<lmm_element_concurrency(&var->cnsts[i])){
476 lmm_disable_var(sys,var);
477 for (j = 0; j < var->cnsts_number; j++)
478 lmm_on_disabled_var(sys,var->cnsts[j].constraint);
479 var->staged_weight=weight;
480 xbt_assert(!var->weight);
482 lmm_increase_concurrency(&var->cnsts[i]);
484 lmm_update_modified_set(sys, cnst);
486 lmm_expand(sys, cnst, var, value);
488 lmm_check_concurrency(sys);
491 lmm_constraint_t lmm_get_cnst_from_var(lmm_system_t /*sys*/, lmm_variable_t var, int num)
493 if (num < var->cnsts_number)
494 return (var->cnsts[num].constraint);
499 double lmm_get_cnst_weight_from_var(lmm_system_t /*sys*/, lmm_variable_t var, int num)
501 if (num < var->cnsts_number)
502 return (var->cnsts[num].value);
507 int lmm_get_number_of_cnst_from_var(lmm_system_t /*sys*/, lmm_variable_t var)
509 return (var->cnsts_number);
512 lmm_variable_t lmm_get_var_from_cnst(lmm_system_t /*sys*/, lmm_constraint_t cnst, lmm_element_t * elem)
515 // That is the first call, pick the first element among enabled_element_set (or disabled_element_set if
516 // enabled_element_set is empty)
517 *elem = (lmm_element_t) xbt_swag_getFirst(&(cnst->enabled_element_set));
519 *elem = (lmm_element_t) xbt_swag_getFirst(&(cnst->disabled_element_set));
521 //elem is not null, so we carry on
522 if(xbt_swag_belongs(*elem,&(cnst->enabled_element_set))){
523 //Look at enabled_element_set, and jump to disabled_element_set when finished
524 *elem = (lmm_element_t) xbt_swag_getNext(*elem, cnst->enabled_element_set.offset);
526 *elem = (lmm_element_t) xbt_swag_getFirst(&(cnst->disabled_element_set));
528 *elem = (lmm_element_t) xbt_swag_getNext(*elem, cnst->disabled_element_set.offset);
532 return (*elem)->variable;
537 //if we modify the swag between calls, normal version may loop forever
538 //this safe version ensures that we browse the swag elements only once
539 lmm_variable_t lmm_get_var_from_cnst_safe(lmm_system_t /*sys*/, lmm_constraint_t cnst, lmm_element_t * elem,
540 lmm_element_t * nextelem, int * numelem)
543 *elem = (lmm_element_t) xbt_swag_getFirst(&(cnst->enabled_element_set));
544 *numelem = xbt_swag_size(&(cnst->enabled_element_set))+xbt_swag_size(&(cnst->disabled_element_set))-1;
546 *elem = (lmm_element_t) xbt_swag_getFirst(&(cnst->disabled_element_set));
555 //elem is not null, so we carry on
556 if(xbt_swag_belongs(*elem,&(cnst->enabled_element_set))){
557 //Look at enabled_element_set, and jump to disabled_element_set when finished
558 *nextelem = (lmm_element_t) xbt_swag_getNext(*elem, cnst->enabled_element_set.offset);
560 *nextelem = (lmm_element_t) xbt_swag_getFirst(&(cnst->disabled_element_set));
562 *nextelem = (lmm_element_t) xbt_swag_getNext(*elem, cnst->disabled_element_set.offset);
564 return (*elem)->variable;
569 void *lmm_constraint_id(lmm_constraint_t cnst)
574 void *lmm_variable_id(lmm_variable_t var)
579 static inline void saturated_constraint_set_update(double usage, int cnst_light_num,
580 dyn_light_t saturated_constraint_set, double *min_usage)
582 xbt_assert(usage > 0,"Impossible");
584 if (*min_usage < 0 || *min_usage > usage) {
586 XBT_HERE(" min_usage=%f (cnst->remaining / cnst->usage =%f)", *min_usage, usage);
587 saturated_constraint_set->data[0] = cnst_light_num;
588 saturated_constraint_set->pos = 1;
589 } else if (*min_usage == usage) {
590 if(saturated_constraint_set->pos == saturated_constraint_set->size) { // realloc the size
591 saturated_constraint_set->size *= 2;
592 saturated_constraint_set->data =
593 (int*) xbt_realloc(saturated_constraint_set->data, (saturated_constraint_set->size) * sizeof(int));
595 saturated_constraint_set->data[saturated_constraint_set->pos] = cnst_light_num;
596 saturated_constraint_set->pos++;
600 static inline void saturated_variable_set_update(s_lmm_constraint_light_t *cnst_light_tab,
601 dyn_light_t saturated_constraint_set, lmm_system_t sys)
603 /* Add active variables (i.e. variables that need to be set) from the set of constraints to saturate (cnst_light_tab)*/
604 lmm_constraint_light_t cnst = NULL;
606 lmm_element_t elem = NULL;
607 xbt_swag_t elem_list = NULL;
609 for(i = 0; i< saturated_constraint_set->pos; i++){
610 cnst = &cnst_light_tab[saturated_constraint_set->data[i]];
611 elem_list = &(cnst->cnst->active_element_set);
612 xbt_swag_foreach(_elem, elem_list) {
613 elem = (lmm_element_t)_elem;
614 //Visiting active_element_set, so, by construction, should never get a zero weight, correct?
615 xbt_assert(elem->variable->weight > 0);
616 if ((elem->value > 0))
617 xbt_swag_insert(elem->variable, &(sys->saturated_variable_set));
622 void lmm_print(lmm_system_t sys)
624 void *_cnst, *_elem, *_var;
625 lmm_constraint_t cnst = NULL;
626 lmm_element_t elem = NULL;
627 lmm_variable_t var = NULL;
628 xbt_swag_t cnst_list = NULL;
629 xbt_swag_t var_list = NULL;
630 xbt_swag_t elem_list = NULL;
631 char print_buf[1024];
632 char *trace_buf = (char*) xbt_malloc0(sizeof(char));
635 /* Printing Objective */
636 var_list = &(sys->variable_set);
637 sprintf(print_buf, "MAX-MIN ( ");
638 trace_buf = (char*) xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
639 strcat(trace_buf, print_buf);
640 xbt_swag_foreach(_var, var_list) {
641 var = (lmm_variable_t)_var;
642 sprintf(print_buf, "'%d'(%f) ", var->id_int, var->weight);
643 trace_buf = (char*) xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
644 strcat(trace_buf, print_buf);
646 sprintf(print_buf, ")");
647 trace_buf = (char*) xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
648 strcat(trace_buf, print_buf);
649 XBT_DEBUG("%20s", trace_buf);
650 trace_buf[0] = '\000';
652 XBT_DEBUG("Constraints");
653 /* Printing Constraints */
654 cnst_list = &(sys->active_constraint_set);
655 xbt_swag_foreach(_cnst, cnst_list) {
656 cnst = (lmm_constraint_t)_cnst;
658 //Show the enabled variables
659 elem_list = &(cnst->enabled_element_set);
660 sprintf(print_buf, "\t");
661 trace_buf = (char*) xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
662 strcat(trace_buf, print_buf);
663 sprintf(print_buf, "%s(",(cnst->sharing_policy)?"":"max");
664 trace_buf = (char*) xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
665 strcat(trace_buf, print_buf);
666 xbt_swag_foreach(_elem, elem_list) {
667 elem = (lmm_element_t)_elem;
668 sprintf(print_buf, "%f.'%d'(%f) %s ", elem->value,
669 elem->variable->id_int, elem->variable->value,(cnst->sharing_policy)?"+":",");
670 trace_buf = (char*) xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
671 strcat(trace_buf, print_buf);
672 if(cnst->sharing_policy)
673 sum += elem->value * elem->variable->value;
675 sum = MAX(sum,elem->value * elem->variable->value);
677 //TODO: Adding disabled elements only for test compatibility, but do we really want them to be printed?
678 elem_list = &(cnst->disabled_element_set);
679 xbt_swag_foreach(_elem, elem_list) {
680 elem = (lmm_element_t)_elem;
681 sprintf(print_buf, "%f.'%d'(%f) %s ", elem->value,
682 elem->variable->id_int, elem->variable->value,(cnst->sharing_policy)?"+":",");
683 trace_buf = (char*) xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
684 strcat(trace_buf, print_buf);
685 if(cnst->sharing_policy)
686 sum += elem->value * elem->variable->value;
688 sum = MAX(sum,elem->value * elem->variable->value);
691 sprintf(print_buf, "0) <= %f ('%d')", cnst->bound, cnst->id_int);
692 trace_buf = (char*) xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
693 strcat(trace_buf, print_buf);
695 if (!cnst->sharing_policy) {
696 sprintf(print_buf, " [MAX-Constraint]");
697 trace_buf = (char*) xbt_realloc(trace_buf, strlen(trace_buf) + strlen(print_buf) + 1);
698 strcat(trace_buf, print_buf);
700 XBT_DEBUG("%s", trace_buf);
701 trace_buf[0] = '\000';
702 xbt_assert(!double_positive(sum - cnst->bound, cnst->bound*sg_maxmin_precision),
703 "Incorrect value (%f is not smaller than %f): %g", sum, cnst->bound, sum - cnst->bound);
704 //if(double_positive(sum - cnst->bound, cnst->bound*sg_maxmin_precision))
705 //XBT_ERROR("Incorrect value (%f is not smaller than %f): %g",sum, cnst->bound, sum - cnst->bound);
708 XBT_DEBUG("Variables");
709 /* Printing Result */
710 xbt_swag_foreach(_var, var_list) {
711 var = (lmm_variable_t)_var;
712 if (var->bound > 0) {
713 XBT_DEBUG("'%d'(%f) : %f (<=%f)", var->id_int, var->weight, var->value, var->bound);
714 xbt_assert(!double_positive(var->value - var->bound, var->bound*sg_maxmin_precision),
715 "Incorrect value (%f is not smaller than %f", var->value, var->bound);
717 XBT_DEBUG("'%d'(%f) : %f", var->id_int, var->weight, var->value);
724 void lmm_solve(lmm_system_t sys)
726 void *_var, *_cnst, *_cnst_next, *_elem;
727 lmm_variable_t var = NULL;
728 lmm_constraint_t cnst = NULL;
729 lmm_element_t elem = NULL;
730 xbt_swag_t cnst_list = NULL;
731 xbt_swag_t var_list = NULL;
732 xbt_swag_t elem_list = NULL;
733 double min_usage = -1;
734 double min_bound = -1;
736 if (!(sys->modified))
739 XBT_IN("(sys=%p)", sys);
741 /* Compute Usage and store the variables that reach the maximum. If selective_update_active is true, only constraints
742 * that changed are considered. Otherwise all constraints with active actions are considered.
744 cnst_list = sys->selective_update_active ? &(sys->modified_constraint_set) : &(sys->active_constraint_set);
746 XBT_DEBUG("Active constraints : %d", xbt_swag_size(cnst_list));
747 /* Init: Only modified code portions: reset the value of active variables */
748 xbt_swag_foreach(_cnst, cnst_list) {
749 cnst = (lmm_constraint_t)_cnst;
750 elem_list = &(cnst->enabled_element_set);
751 //XBT_DEBUG("Variable set : %d", xbt_swag_size(elem_list));
752 xbt_swag_foreach(_elem, elem_list) {
753 var = ((lmm_element_t)_elem)->variable;
754 xbt_assert(var->weight > 0.0);
759 s_lmm_constraint_light_t *cnst_light_tab =
760 (s_lmm_constraint_light_t *)xbt_malloc0(xbt_swag_size(cnst_list)*sizeof(s_lmm_constraint_light_t));
761 int cnst_light_num = 0;
762 dyn_light_t saturated_constraint_set = xbt_new0(s_dyn_light_t,1);
763 saturated_constraint_set->size = 5;
764 saturated_constraint_set->data = xbt_new0(int, saturated_constraint_set->size);
766 xbt_swag_foreach_safe(_cnst, _cnst_next, cnst_list) {
767 cnst = (lmm_constraint_t)_cnst;
768 /* INIT: Collect constraints that actually need to be saturated (i.e remaining and usage are strictly positive)
769 * into cnst_light_tab. */
770 cnst->remaining = cnst->bound;
771 if (!double_positive(cnst->remaining, cnst->bound*sg_maxmin_precision))
774 elem_list = &(cnst->enabled_element_set);
775 xbt_swag_foreach(_elem, elem_list) {
776 elem = (lmm_element_t)_elem;
777 xbt_assert(elem->variable->weight > 0);
778 if ((elem->value > 0)) {
779 if (cnst->sharing_policy)
780 cnst->usage += elem->value / elem->variable->weight;
781 else if (cnst->usage < elem->value / elem->variable->weight)
782 cnst->usage = elem->value / elem->variable->weight;
784 make_elem_active(elem);
785 simgrid::surf::Action *action = static_cast<simgrid::surf::Action*>(elem->variable->id);
786 if (sys->keep_track && !action->is_linked())
787 sys->keep_track->push_back(*action);
790 XBT_DEBUG("Constraint '%d' usage: %f remaining: %f concurrency: %i<=%i<=%i", cnst->id_int, cnst->usage,
791 cnst->remaining,cnst->concurrency_current,cnst->concurrency_maximum,cnst->concurrency_limit);
792 /* Saturated constraints update */
794 if(cnst->usage > 0) {
795 cnst_light_tab[cnst_light_num].cnst = cnst;
796 cnst->cnst_light = &(cnst_light_tab[cnst_light_num]);
797 cnst_light_tab[cnst_light_num].remaining_over_usage = cnst->remaining / cnst->usage;
798 saturated_constraint_set_update(cnst_light_tab[cnst_light_num].remaining_over_usage,
799 cnst_light_num, saturated_constraint_set, &min_usage);
800 xbt_assert(cnst->active_element_set.count>0, "There is no sense adding a constraint that has no active element!");
805 saturated_variable_set_update( cnst_light_tab, saturated_constraint_set, sys);
807 /* Saturated variables update */
809 /* Fix the variables that have to be */
810 var_list = &(sys->saturated_variable_set);
812 xbt_swag_foreach(_var, var_list) {
813 var = (lmm_variable_t)_var;
814 if (var->weight <= 0.0)
816 /* First check if some of these variables could reach their upper bound and update min_bound accordingly. */
818 ("var=%d, var->bound=%f, var->weight=%f, min_usage=%f, var->bound*var->weight=%f",
819 var->id_int, var->bound, var->weight, min_usage, var->bound * var->weight);
820 if ((var->bound > 0) && (var->bound * var->weight < min_usage)) {
822 min_bound = var->bound*var->weight;
824 min_bound = MIN(min_bound, (var->bound*var->weight));
825 XBT_DEBUG("Updated min_bound=%f", min_bound);
829 while ((var = (lmm_variable_t)xbt_swag_getFirst(var_list))) {
833 //If no variable could reach its bound, deal iteratively the constraints usage ( at worst one constraint is
834 // saturated at each cycle)
835 var->value = min_usage / var->weight;
836 // XBT_DEBUG("Setting %p (%d) value to %f\n", var, var->id_int, var->value);
837 XBT_DEBUG("Setting var (%d) value to %f\n", var->id_int, var->value);
839 //If there exist a variable that can reach its bound, only update it (and other with the same bound) for now.
840 if (double_equals(min_bound, var->bound*var->weight, sg_maxmin_precision)){
841 var->value = var->bound;
842 XBT_DEBUG("Setting %p (%d) value to %f\n", var, var->id_int, var->value);
844 // Variables which bound is different are not considered for this cycle, but they will be afterwards.
845 XBT_DEBUG("Do not consider %p (%d) \n", var, var->id_int);
846 xbt_swag_remove(var, var_list);
850 XBT_DEBUG("Min usage: %f, Var(%d)->weight: %f, Var(%d)->value: %f ",
851 min_usage, var->id_int, var->weight, var->id_int, var->value);
853 /* Update the usage of contraints where this variable is involved */
854 for (i = 0; i < var->cnsts_number; i++) {
855 elem = &var->cnsts[i];
856 cnst = elem->constraint;
857 if (cnst->sharing_policy) {
858 //Remember: shared constraints require that sum(elem->value * var->value) < cnst->bound
859 double_update(&(cnst->remaining), elem->value * var->value, cnst->bound*sg_maxmin_precision);
860 double_update(&(cnst->usage), elem->value / var->weight, sg_maxmin_precision);
861 //If the constraint is saturated, remove it from the set of active constraints (light_tab)
862 if(!double_positive(cnst->usage,sg_maxmin_precision) ||
863 !double_positive(cnst->remaining,cnst->bound*sg_maxmin_precision)) {
864 if (cnst->cnst_light) {
865 int index = (cnst->cnst_light-cnst_light_tab);
866 XBT_DEBUG("index: %d \t cnst_light_num: %d \t || usage: %f remaining: %f bound: %f ",
867 index,cnst_light_num, cnst->usage, cnst->remaining, cnst->bound);
868 //XBT_DEBUG("index: %d \t cnst_light_num: %d \t || \t cnst: %p \t cnst->cnst_light: %p "
869 // "\t cnst_light_tab: %p usage: %f remaining: %f bound: %f ", index,cnst_light_num,
870 // cnst, cnst->cnst_light, cnst_light_tab, cnst->usage, cnst->remaining, cnst->bound);
871 cnst_light_tab[index]=cnst_light_tab[cnst_light_num-1];
872 cnst_light_tab[index].cnst->cnst_light = &cnst_light_tab[index];
874 cnst->cnst_light = NULL;
877 cnst->cnst_light->remaining_over_usage = cnst->remaining / cnst->usage;
879 make_elem_inactive(elem);
881 //Remember: non-shared constraints only require that max(elem->value * var->value) < cnst->bound
883 make_elem_inactive(elem);
884 elem_list = &(cnst->enabled_element_set);
885 xbt_swag_foreach(_elem, elem_list) {
886 elem = (lmm_element_t)_elem;
887 xbt_assert(elem->variable->weight > 0);
888 if (elem->variable->value > 0) continue;
890 cnst->usage = MAX(cnst->usage, elem->value / elem->variable->weight);
892 //If the constraint is saturated, remove it from the set of active constraints (light_tab)
893 if(!double_positive(cnst->usage,sg_maxmin_precision) ||
894 !double_positive(cnst->remaining,cnst->bound*sg_maxmin_precision)) {
895 if(cnst->cnst_light) {
896 int index = (cnst->cnst_light-cnst_light_tab);
897 XBT_DEBUG("index: %d \t cnst_light_num: %d \t || \t cnst: %p \t cnst->cnst_light: %p "
898 "\t cnst_light_tab: %p usage: %f remaining: %f bound: %f ", index,cnst_light_num, cnst,
899 cnst->cnst_light, cnst_light_tab, cnst->usage, cnst->remaining, cnst->bound);
900 cnst_light_tab[index]=cnst_light_tab[cnst_light_num-1];
901 cnst_light_tab[index].cnst->cnst_light = &cnst_light_tab[index];
903 cnst->cnst_light = NULL;
906 cnst->cnst_light->remaining_over_usage = cnst->remaining / cnst->usage;
907 xbt_assert(cnst->active_element_set.count>0, "Should not keep a maximum constraint that has no active"
908 " element! You want to check the maxmin precision and possible rounding effects." );
912 xbt_swag_remove(var, var_list);
915 /* Find out which variables reach the maximum */
918 saturated_constraint_set->pos = 0;
920 for(pos=0; pos<cnst_light_num; pos++){
921 xbt_assert(cnst_light_tab[pos].cnst->active_element_set.count>0, "Cannot saturate more a constraint that has"
922 " no active element! You may want to change the maxmin precision (--cfg=maxmin/precision:<new_value>)"
923 " because of possible rounding effects.\n\tFor the record, the usage of this constraint is %g while "
924 "the maxmin precision to which it is compared is %g.\n\tThe usage of the previous constraint is %g.",
925 cnst_light_tab[pos].cnst->usage, sg_maxmin_precision, cnst_light_tab[pos-1].cnst->usage);
926 saturated_constraint_set_update(cnst_light_tab[pos].remaining_over_usage, pos, saturated_constraint_set,
930 saturated_variable_set_update(cnst_light_tab, saturated_constraint_set, sys);
932 } while (cnst_light_num > 0);
935 if (sys->selective_update_active)
936 lmm_remove_all_modified_set(sys);
938 if (XBT_LOG_ISENABLED(surf_maxmin, xbt_log_priority_debug)) {
942 lmm_check_concurrency(sys);
944 xbt_free(saturated_constraint_set->data);
945 xbt_free(saturated_constraint_set);
946 xbt_free(cnst_light_tab);
950 /** \brief Attribute the value bound to var->bound.
952 * \param sys the lmm_system_t
953 * \param var the lmm_variable_t
954 * \param bound the new bound to associate with var
956 * Makes var->bound equal to bound. Whenever this function is called a change is signed in the system. To
957 * avoid false system changing detection it is a good idea to test (bound != 0) before calling it.
959 void lmm_update_variable_bound(lmm_system_t sys, lmm_variable_t var, double bound)
964 if (var->cnsts_number)
965 lmm_update_modified_set(sys, var->cnsts[0].constraint);
968 int lmm_concurrency_slack(lmm_constraint_t cnstr){
969 //FIXME MARTIN: Replace by infinite value std::numeric_limits<int>::(max)(), or something better within Simgrid?
970 if(cnstr->concurrency_limit<0)
973 return cnstr->concurrency_limit - cnstr->concurrency_current;
976 /** \brief Measure the minimum concurrency slack across all constraints where the given var is involved */
977 int lmm_cnstrs_min_concurrency_slack(lmm_variable_t var){
979 //FIXME MARTIN: Replace by infinite value std::numeric_limits<int>::(max)(), or something better within Simgrid?
980 int slack,minslack=666;
981 for (i = 0; i < var->cnsts_number; i++) {
982 slack=lmm_concurrency_slack(var->cnsts[i].constraint);
984 //This is only an optimization, to avoid looking at more constraints when slack is already zero
985 //Disable it when debugging to let lmm_concurrency_slack catch nasty things
986 if(!slack && !XBT_LOG_ISENABLED(surf_maxmin, xbt_log_priority_debug))
996 /* /Check if a variable can be enabled
998 * Make sure to set staged_weight before, if your intent is only to check concurrency
1000 int lmm_can_enable_var(lmm_variable_t var){
1001 return var->staged_weight>0 && lmm_cnstrs_min_concurrency_slack(var)>=var->concurrency_share;
1004 //Small remark: In this implementation of lmm_enable_var and lmm_disable_var, we will meet multiple times with var when
1005 // running lmm_update_modified_set.
1006 //A priori not a big performance issue, but we might do better by calling lmm_update_modified_set within the for loops
1007 // (after doing the first for enabling==1, and before doing the last for disabling==1)
1008 void lmm_enable_var(lmm_system_t sys, lmm_variable_t var){
1012 xbt_assert(lmm_can_enable_var(var));
1014 var->weight = var->staged_weight;
1015 var->staged_weight = 0;
1017 //Enabling the variable, move to var to list head. Subtility is: here, we need to call lmm_update_modified_set AFTER
1018 // moving at least one element of var.
1020 xbt_swag_remove(var, &(sys->variable_set));
1021 xbt_swag_insert_at_head(var, &(sys->variable_set));
1022 for (i = 0; i < var->cnsts_number; i++) {
1023 elem = &var->cnsts[i];
1024 xbt_swag_remove(elem, &(elem->constraint->disabled_element_set));
1025 xbt_swag_insert_at_head(elem, &(elem->constraint->enabled_element_set));
1026 lmm_increase_concurrency(elem);
1028 if (var->cnsts_number)
1029 lmm_update_modified_set(sys, var->cnsts[0].constraint);
1031 //When used within lmm_on_disabled_var, we would get an assertion fail, because transiently there can be variables
1032 // that are staged and could be activated.
1033 //Anyway, caller functions all call lmm_check_concurrency() in the end.
1034 // lmm_check_concurrency(sys);
1037 void lmm_disable_var(lmm_system_t sys, lmm_variable_t var){
1041 xbt_assert(!var->staged_weight,"Staged weight should have been cleared");
1042 //Disabling the variable, move to var to list tail. Subtility is: here, we need to call lmm_update_modified_set BEFORE
1043 //moving the last element of var.
1044 xbt_swag_remove(var, &(sys->variable_set));
1045 xbt_swag_insert_at_tail(var, &(sys->variable_set));
1046 if (var->cnsts_number)
1047 lmm_update_modified_set(sys, var->cnsts[0].constraint);
1048 for (i = 0; i < var->cnsts_number; i++) {
1049 elem = &var->cnsts[i];
1050 xbt_swag_remove(elem, &(elem->constraint->enabled_element_set));
1051 xbt_swag_insert_at_tail(elem, &(elem->constraint->disabled_element_set));
1053 xbt_swag_remove(elem, &(elem->constraint->active_element_set));
1055 lmm_decrease_concurrency(elem);
1059 var->staged_weight=0.0;
1061 lmm_check_concurrency(sys);
1064 /* /brief Find variables that can be enabled and enable them.
1066 * Assuming that the variable has already been removed from non-zero weights
1067 * Can we find a staged variable to add?
1068 * If yes, check that none of the constraints that this variable is involved in is at the limit of its concurrency
1069 * And then add it to enabled variables
1071 void lmm_on_disabled_var(lmm_system_t sys, lmm_constraint_t cnstr){
1073 lmm_element_t nextelem;
1076 if(cnstr->concurrency_limit<0)
1079 numelem=xbt_swag_size(&(cnstr->disabled_element_set));
1083 elem= (lmm_element_t) xbt_swag_getFirst(&(cnstr->disabled_element_set));
1085 //Cannot use xbt_swag_foreach, because lmm_enable_var will modify disabled_element_set.. within the loop
1086 while(numelem-- && elem ){
1088 nextelem = (lmm_element_t) xbt_swag_getNext(elem, cnstr->disabled_element_set.offset);
1090 if (elem->variable->staged_weight>0 ){
1091 //Found a staged variable
1092 //TODOLATER: Add random timing function to model reservation protocol fuzziness? Then how to make sure that
1093 //staged variables will eventually be called?
1094 if(lmm_can_enable_var(elem->variable)){
1095 lmm_enable_var(sys,elem->variable);
1099 xbt_assert(cnstr->concurrency_current<=cnstr->concurrency_limit,"Concurrency overflow!");
1100 if(cnstr->concurrency_current==cnstr->concurrency_limit)
1106 //We could get an assertion fail, because transiently there can be variables that are staged and could be activated.
1107 //And we need to go through all constraints of the disabled var before getting back a coherent state.
1108 //Anyway, caller functions all call lmm_check_concurrency() in the end.
1109 // lmm_check_concurrency(sys);
1112 /* \brief update the weight of a variable, and enable/disable it.
1113 * @return Returns whether a change was made
1115 void lmm_update_variable_weight(lmm_system_t sys, lmm_variable_t var, double weight)
1119 xbt_assert(weight>=0,"Variable weight should not be negative!");
1121 if (weight == var->weight)
1124 int enabling_var= (weight>0 && var->weight<=0);
1125 int disabling_var= (weight<=0 && var->weight>0);
1127 XBT_IN("(sys=%p, var=%p, weight=%f)", sys, var, weight);
1131 //Are we enabling this variable?
1133 var->staged_weight = weight;
1134 minslack=lmm_cnstrs_min_concurrency_slack(var);
1135 if(minslack<var->concurrency_share){
1136 XBT_DEBUG("Staging var (instead of enabling) because min concurrency slack %i, with weight %f and concurrency"
1137 " share %i", minslack, weight, var->concurrency_share);
1140 XBT_DEBUG("Enabling var with min concurrency slack %i", minslack);
1141 lmm_enable_var(sys,var);
1142 } else if (disabling_var){
1143 //Are we disabling this variable?
1144 lmm_disable_var(sys,var);
1149 lmm_check_concurrency(sys);
1155 double lmm_get_variable_weight(lmm_variable_t var)
1160 void lmm_update_constraint_bound(lmm_system_t sys, lmm_constraint_t cnst, double bound)
1163 lmm_update_modified_set(sys, cnst);
1164 cnst->bound = bound;
1167 int lmm_constraint_used(lmm_system_t sys, lmm_constraint_t cnst)
1169 return xbt_swag_belongs(cnst, &(sys->active_constraint_set));
1172 inline lmm_constraint_t lmm_get_first_active_constraint(lmm_system_t sys)
1174 return (lmm_constraint_t)xbt_swag_getFirst(&(sys->active_constraint_set));
1177 inline lmm_constraint_t lmm_get_next_active_constraint(lmm_system_t sys, lmm_constraint_t cnst)
1179 return (lmm_constraint_t)xbt_swag_getNext(cnst, (sys->active_constraint_set).offset);
1182 /** \brief Update the constraint set propagating recursively to
1183 * other constraints so the system should not be entirely computed.
1185 * \param sys the lmm_system_t
1186 * \param cnst the lmm_constraint_t affected by the change
1188 * A recursive algorithm to optimize the system recalculation selecting only constraints that have changed. Each
1189 * constraint change is propagated to the list of constraints for each variable.
1191 static void lmm_update_modified_set_rec(lmm_system_t sys, lmm_constraint_t cnst)
1195 //TODOLATER: Why lmm_modified_set has been changed in git version 2392B5157...? Looks equivalent logically and less obvious..
1196 xbt_swag_foreach(_elem, &cnst->enabled_element_set) {
1197 lmm_variable_t var = ((lmm_element_t)_elem)->variable;
1198 s_lmm_element_t *cnsts = var->cnsts;
1200 for (i = 0; var->visited != sys->visited_counter && i < var->cnsts_number ; i++) {
1201 if (cnsts[i].constraint != cnst && !xbt_swag_belongs(cnsts[i].constraint, &sys->modified_constraint_set)) {
1202 xbt_swag_insert(cnsts[i].constraint, &sys->modified_constraint_set);
1203 lmm_update_modified_set_rec(sys, cnsts[i].constraint);
1206 //var will be ignored in later visits as long as sys->visited_counter does not move
1207 var->visited = sys->visited_counter;
1211 static void lmm_update_modified_set(lmm_system_t sys, lmm_constraint_t cnst)
1213 /* nothing to do if selective update isn't active */
1214 if (sys->selective_update_active && !xbt_swag_belongs(cnst, &sys->modified_constraint_set)) {
1215 xbt_swag_insert(cnst, &sys->modified_constraint_set);
1216 lmm_update_modified_set_rec(sys, cnst);
1220 /** \brief Remove all constraints of the modified_constraint_set.
1222 * \param sys the lmm_system_t
1224 static void lmm_remove_all_modified_set(lmm_system_t sys)
1226 //We cleverly un-flag all variables just by incrementing sys->visited_counter
1227 //In effect, the var->visited value will no more be equal to sys->visited counter
1228 //To be clean, when visited counter has wrapped around, we force these var->visited values so that variables that
1229 //were in the modified a long (long long) time ago are not wrongly skipped here, which would lead to very nasty bugs
1230 //(i.e. not readibily reproducible, and requiring a lot of run time before happening).
1231 if (++sys->visited_counter == 1) {
1232 /* the counter wrapped around, reset each variable->visited */
1234 xbt_swag_foreach(_var, &sys->variable_set)
1235 ((lmm_variable_t)_var)->visited = 0;
1237 xbt_swag_reset(&sys->modified_constraint_set);
1241 * Returns total resource load
1243 * \param cnst the lmm_constraint_t associated to the resource
1245 * This is dead code, but we may use it later for debug/trace.
1247 double lmm_constraint_get_usage(lmm_constraint_t cnst) {
1249 xbt_swag_t elem_list = &(cnst->enabled_element_set);
1251 lmm_element_t elem = NULL;
1253 xbt_swag_foreach(_elem, elem_list) {
1254 elem = (lmm_element_t)_elem;
1255 if ((elem->value > 0)) {
1256 if (cnst->sharing_policy)
1257 usage += elem->value * elem->variable->value;
1258 else if (usage < elem->value * elem->variable->value)
1259 usage = elem->value * elem->variable->value;
1265 void lmm_check_concurrency(lmm_system_t sys){
1270 lmm_constraint_t cnst;
1273 int i,belong_to_enabled,belong_to_disabled,belong_to_active;
1275 //These checks are very expensive, so do them only if we want to debug SURF LMM
1276 if (XBT_LOG_ISENABLED(surf_maxmin, xbt_log_priority_debug)) {
1277 xbt_swag_foreach(_cnst, &(sys->constraint_set)) {
1278 cnst = (lmm_constraint_t) _cnst;
1280 xbt_swag_foreach(_elem, &(cnst->enabled_element_set)) {
1281 elem = (lmm_element_t)_elem;
1282 xbt_assert(elem->variable->weight > 0);
1283 concurrency+=lmm_element_concurrency(elem);
1286 xbt_swag_foreach(_elem, &(cnst->disabled_element_set)) {
1287 elem = (lmm_element_t)_elem;
1288 //We should have staged variables only if concurrency is reached in some constraint
1289 xbt_assert(cnst->concurrency_limit<0 || elem->variable->staged_weight==0 ||
1290 lmm_cnstrs_min_concurrency_slack(elem->variable) < elem->variable->concurrency_share,
1291 "should not have staged variable!");
1294 xbt_assert(cnst->concurrency_limit<0 || cnst->concurrency_limit >= concurrency,"concurrency check failed!");
1295 xbt_assert(cnst->concurrency_current == concurrency, "concurrency_current is out-of-date!");
1298 //Check that for each variable, all corresponding elements are in the same state (i.e. same element sets)
1299 xbt_swag_foreach(_var, &(sys->variable_set)) {
1300 var= (lmm_variable_t) _var;
1302 if(!var->cnsts_number)
1305 elem = &var->cnsts[0];
1306 belong_to_enabled=xbt_swag_belongs(elem,&(elem->constraint->enabled_element_set));
1307 belong_to_disabled=xbt_swag_belongs(elem,&(elem->constraint->disabled_element_set));
1308 belong_to_active=xbt_swag_belongs(elem,&(elem->constraint->active_element_set));
1310 for (i = 1; i < var->cnsts_number; i++) {
1311 elem = &var->cnsts[i];
1312 xbt_assert(belong_to_enabled==xbt_swag_belongs(elem,&(elem->constraint->enabled_element_set)),
1313 "Variable inconsistency (1): enabled_element_set");
1314 xbt_assert(belong_to_disabled==xbt_swag_belongs(elem,&(elem->constraint->disabled_element_set)),
1315 "Variable inconsistency (2): disabled_element_set");
1316 xbt_assert(belong_to_active==xbt_swag_belongs(elem,&(elem->constraint->active_element_set)),
1317 "Variable inconsistency (3): active_element_set");